DDT TOO REQUEST OF MAXI J1543-564
MAXI J1543-564 is a transient Galactic black hole X-ray binary (BHXRB) candidate with a single outburst detected in 2011 without any robust constraints on its physical and dynamical parameters. After MAXI spotted this source getting brighter in December 2025, a NuSTAR DDT observation was conducted, suggesting that the source is in an intermediate state with an absorption line at a strange energy of about 6.91 keV. This presents a unique opportunity for XRISM to assess the disc winds in a bright intermediate or soft state, investigate the highly redshifted and highly ionised lines in an XRB and a potentially rare accretion configuration with both disc winds and relativistic reflection, as well as get a high-resolution view of a BH with a very low recurrence rate.
TELESCOP= 'XRISM ' / Mission name INSTRUME= 'RESOLVE ' / Instrument name FILTER = 'OPEN ' / Filter name used OBS_ID = '902003010' / Observation identification string OBJECT = 'MAXI_J1543-564' / Object name OBSERVER= 'XRISM Collaboration' / PI name OBS_MODE= 'POINTING' / POINTING or SLEW or ALL RA_OBJ = 235.8223 / [deg] Object Right ascension DEC_OBJ = -56.4136 / [deg] Object Declination RA_PNT = 235.814590465101 / Pointing RA DEC_PNT = -56.4137343746499 / Pointing DEC RA_NOM = 235.821911529606 / [deg] Nominal aspect point R.A. DEC_NOM = -56.413182775641 / [deg] Nominal aspect point Dec. PA_NOM = 88.8184947542689 / [deg] Nominal aspect point roll. TELAPSE = 98646.086796999 / Elapsed time DATE-OBS= '2026-01-28T22:54:21.979062' / Start date DATE-END= '2026-01-30T02:18:28.065859' / Stop date ONTIME = 74496.008455 / On-source time EXPOSURE= 74496.008455 / Exposure time PROCVER = '03.03.015.012' / Processing script version MKFFF = 'ISAS/JAXA' / Origin of First FITS file ORIGIN = 'GSFC/NASA' / Origin of Processed FITS file SOFTVER = 'Hea_26Sep2025_V6.36_XRISM_12Sep2025_V003' / Version of HEADAS used CALDBVER= 'gen20241115_xtd20250915_rsl20250915' / Version of CALDB used DATE = '2026-02-04T02:07:45' / Date and time this file was created or updated SIB2_VER= 'V04.00 ' / SIB2 version JAXA